Aircraft fuselages

ABSTRACT

Aircraft fuselages are disclosed herein. An example apparatus includes a fuselage of an aircraft having a first section and a second section to which a tail assembly is to be coupled. The second section is aft of the first section and is to extend to at least a trailing edge of a horizontal stabilizer of the tail assembly. A first width of the first section decreases from a front to a rear of the first section, and a second width of the second section is substantially constant.

RELATED APPLICATION

This patent arises from a continuation of U.S. patent application Ser.No. 14/976,988 (now U.S. Pat. No. 9,505,481), titled “AircraftFuselages,” filed Dec. 21, 2015, which is a continuation of U.S. patentapplication Ser. No. 13/659,180 (now U.S. Pat. No. 9,216,807), titled“Aircraft Fuselages,” filed Oct. 24, 2012. U.S. patent application Ser.Nos. 14/976,988 and 13/659,180 are hereby incorporated by this referencein their entireties.

FIELD

The present disclosure relates generally to aircraft and, moreparticularly, to aircraft fuselages.

BACKGROUND

An aircraft generally includes a tail assembly coupled to a fuselage.The tail assembly may include a horizontal stabilizer and a verticalstabilizer positioned adjacent a rear end of the fuselage. Typically,the horizontal stabilizer limits pitching motion of a nose of theaircraft, and the vertical stabilizer limits yawing motion of the nose.During flight, air flowing across the fuselage and the tail assemblyproduces drag on the aircraft.

SUMMARY

An example apparatus includes a fuselage of an aircraft having a firstsection and a second section to which a tail assembly is to be coupled.The second section is aft of the first section and is to extend to atleast a trailing edge of a horizontal stabilizer of the tail assembly. Afirst width of the first section decreases from a front to a rear of thefirst section, and a second width of the second section is substantiallyconstant.

Another example apparatus includes a portion of a fuselage to which atail assembly is to be coupled. The portion of the fuselage includes afirst section, a second section and a third section. First lateralsurfaces of the first section are converging inboard. The second sectionis aft of the first section and has substantially parallel secondlateral surfaces. The second section is to extend to a trailing edge ofa horizontal stabilizer of the tail assembly. The third section is aftof the second section and has third lateral surfaces converging inboard

Another example apparatus includes a first section of a fuselage of anaircraft having a first shape such that lateral surfaces of the firstsection are converging from a front to a rear of the first section bymore than ten degrees relative to a longitudinal axis of the fuselage. Avertical stabilizer is to be disposed along a portion of the firstsection. The example apparatus also includes a second section of thefuselage aft of the first section. The second section has a second shapesuch that lateral surfaces of the second section are oriented tendegrees or less from being parallel to the longitudinal axis of thefuselage. The second section is to extend to a trailing edge of ahorizontal stabilizer.

An example method disclosed herein includes directing first lateralsurfaces of a first section of a fuselage of an aircraft to beconverging inboard from a front to a rear of the first section. Theexample method further includes directing second lateral surfaces of asecond section of the fuselage to be substantially parallel. The secondlateral surfaces are to be aft of the first section and are to extend toat least a trailing edge of a horizontal stabilizer.

The features, functions and advantages that have been discussed can beachieved independently in various examples or may be combined in yetother examples further details of which can be seen with reference tothe following description and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top view of an example aircraft disclosed herein.

FIG. 2 is a side view of the example aircraft of FIG. 1.

FIG. 3 is a top view of a tail portion of a fuselage of the exampleaircraft of FIGS. 1-2.

FIG. 4 is a perspective view of the tail portion of the example fuselageof FIGS. 1-3.

FIG. 5 is a rear view of the example fuselage of FIGS. 1-4.

FIG. 6 is a top view of a tail portion of another example fuselagedisclosed herein.

FIG. 7 is a top view of a tail portion of yet another example fuselagedisclosed herein.

FIG. 8 is a top view of a tail portion of another example fuselagedisclosed herein.

FIG. 9 is a flow chart representative of an example method disclosedherein.

Wherever possible, the same reference numbers will be used throughoutthe drawing(s) and accompanying written description to refer to the sameor like parts. As used in this disclosure, stating that any part (e.g.,a layer, film, area, or plate) is in any way positioned on (e.g.,positioned on, located on, disposed on, or formed on, etc.) anotherpart, means that the referenced part is either in contact with the otherpart, or that the referenced part is above the other part with one ormore intermediate part(s) located therebetween. Stating that any part isin contact with another part means that there is no intermediate partbetween the two parts.

DESCRIPTION

Aircraft fuselages are disclosed herein. An example apparatus includes afuselage of an aircraft having a first section and a second section towhich a tail assembly is to be coupled. In some examples, the tailassembly includes a horizontal stabilizer and a vertical stabilizer. Thesecond section may be aft of the first section and may extend to atrailing edge of the horizontal stabilizer. In some examples, a firstwidth of the first section decreases from a front to a rear of the firstsection, and a second width of the second section is substantiallyconstant. The example apparatus may include a third section aft of thesecond section. In some such examples, the third section may have athird width decreasing from a front to a rear of the third section.During flight, air flowing over the tail portion produces drag on theaircraft. However, the shape of the example tail portion substantiallyprevents air flow separation along the tail portion of the fuselage.

FIG. 1 is a top view of an example aircraft 100 disclosed herein. In theillustrated example, the aircraft 100 includes a fuselage 102 having anose portion 104, a central portion 106, and a tail portion 108. In theillustrated example, the nose portion 104 defines a nose-end 110, andthe tail portion 108 defines a tail-end 112. A first wing 114 and asecond wing 116 are coupled to the central portion 106 of the examplefuselage 102. In the illustrated example, a first engine 118 and asecond engine 120 are coupled to the first wing 114 and the second wing116, respectively. The aircraft 100 illustrated in FIG. 1 is merely anexample. Thus, other types of aircraft may be used without departingfrom the scope of this disclosure.

The example aircraft 100 of FIG. 1 includes a tail assembly 122 (e.g.,an empennage) coupled to the tail portion 108 of the fuselage 102. Inthe illustrated example, the tail assembly 122 includes a horizontalstabilizer 124 and a vertical stabilizer 126. The example horizontalstabilizer 124 includes a first fixed wing 128 and a second fixed wing130. In the illustrated example, the first fixed wing 128 is disposed ona first side 132 of the fuselage 102, and the second fixed wing 130 isdisposed on a second side 134 of the fuselage 102 opposite the firstside 132. In some examples, the horizontal stabilizer 124 includes oneor more elevators to control a pitch (e.g., up-and-down motion) of thenose-end 110 of the aircraft 100. In the illustrated example, thevertical stabilizer 126 is disposed along a longitudinal axis 136 of thefuselage 102. In some examples, the vertical stabilizer 126 includes arudder to control a yaw (side-to-side motion) of the nose-end 110 of theaircraft 100.

FIG. 2 is a side view of the example aircraft 100 of FIG. 1. In theillustrated example, the tail portion 108 of the fuselage 102 defines anupsweep 200. The example vertical stabilizer 126 includes a leading edge202 and a trailing edge 204. In the illustrated example, the leadingedge 202 of the vertical stabilizer 126 extends from the fuselage 102fore of the horizontal stabilizer 124.

FIG. 3 is a top view of the tail portion 108 of the example fuselage102. In the illustrated example, the tail portion 108 includes a firstsection 300, a second section 302 and a third section 304. In theillustrated example, the tail assembly 122 is disposed on the firstsection 300 and the second section 302. The example third section 304 isdisposed aft of the tail assembly 122. In the illustrated example, thefirst section 300 extends from about the leading edge 202 of thevertical stabilizer 126 to a position along a chord of the horizontalstabilizer 124 (i.e., a position between a leading edge 306 and atrailing edge 308 of the horizontal stabilizer 124). In other examples,the first section 300 extends to and from other positions along theaircraft 100. The example second section 302 extends from the firstsection 300 (i.e., from the position along the chord of the horizontalstabilizer 124) to the trailing edge 308 of the horizontal stabilizer124. In other examples, the second section 302 extends to and from otherpositions along the aircraft 100 (e.g., the second section 302 mayextend up to a position fore of the trailing edge 308 of the horizontalstabilizer, the second section 302 may extend aft of the trailing edge308 of the horizontal stabilizer, etc.). The example third section 304of FIG. 3 extends from the second section 302 (i.e., from the trailingedge 308 of the horizontal stabilizer 124) to the rear-end 112 of thefuselage 102. Thus, in the illustrated example, the third section 304 isaft of the horizontal stabilizer 124. In other examples, the thirdsection 304 extends to and from other positions along the aircraft 100.

The example first section 300 has a first shape. In the illustratedexample, a first width of the first section 300 decreases rearwards(i.e., from a front to a rear of the first section 300). Thus, firstlateral surfaces 310 and 312 of the fuselage 102 along the first section300 are converging inboard. In some examples, the first width of thefirst section 300 decreases at a constant rate (i.e., the first lateralsurfaces 310 and 312 of the fuselage 102 along the first section 300 aresubstantially straight). In other examples, the first width decreases atan inconstant or varying rate (i.e., the first lateral surfaces 310 and312 are curved). In the illustrated example, the first lateral surfaces310 and 312 are converging inboard by more than ten degrees relative tothe longitudinal axis 136 of the fuselage 102. In other examples, thefirst section 300 is other shapes and, thus, the first lateral surfaces310 and 312 may converge via greater or lesser angles.

In the illustrated example, the second section 302 has a second shape inwhich a second width of the second section 302 is substantially constant(i.e., second lateral surfaces 314 and 316 of the fuselage 102 along theexample second section 302 are oriented within about ten degrees ofbeing parallel to the longitudinal axis 136 of the fuselage 102). Theexample second lateral surfaces 314 and 316 of FIG. 3 are parallel tothe longitudinal axis 136 of the fuselage 102. As described in greaterdetail below, other examples have other shapes.

The example third section 304 of FIG. 3 has a third shape. In theillustrated example, a third width of the third section 304 decreasesrearwards (i.e., from a front to a rear of the third section 304). Thus,third lateral surfaces 318 and 320 of the fuselage 102 along the thirdsection 304 converge inboard. In some examples, the third width of thethird section 304 decreases at a constant rate (e.g., the third lateralsurfaces 318 and 320 of the fuselage 102 along the third section 304 aresubstantially straight). In other examples, the third width decreases atan inconstant or varying rate (e.g., the third lateral surfaces 318 and320 are curved). In the illustrated example, the third lateral surfaces318 and 320 are converging by more than ten degrees relative to thelongitudinal axis 136 of the fuselage 102. In other examples, the thirdsection 304 is other shapes and, thus, the third lateral surfaces 318and 320 may converge via greater or lesser angles. In the illustratedexample, the third section 304 defines the tail-end 112.

FIG. 4 is a perspective view of the tail portion 108 of the examplefuselage 102. In the illustrated example, as the third width of thethird section 304 decreases, the third section 304 also defines adownsweep 400 (i.e., a top surface 402 of the third section 304 curvesdownward in the orientation of FIG. 4) and a portion of the upsweep 200.As a result, the example tail-end 112 of the fuselage 102 has a circularcross-section. In the illustrated example, the tail-end 112 issubstantially perpendicular to the longitudinal axis 136 of the fuselage102. However, the above-noted shapes are merely examples and, thus,other shapes (e.g., conical, etc.) may be used without departing fromthe scope of this disclosure.

FIG. 5 is a rear view of the tail portion 108 of the example fuselage102. In the illustrated example, the first side 132 and the second side134 of the fuselage 102 along the second section 302 define a firstplanar surface 500 and a second planar surface 502, respectively. In theillustrated example, the first planar surface 500 and the second planarsurface 502 are substantially parallel to a longitudinal axis of thevertical stabilizer 126. Other examples are other shapes.

During flight, air passing over the fuselage 102 and the tail assembly122 produces drag on the example aircraft 100. However, the exampleshapes of the first section 300, the second section 302 and/or the thirdsection 304 of the tail portion 108 substantially prevent air flowseparation along the tail portion 108 of the fuselage 102. As a result,the example fuselage 102 of FIGS. 1-5 produces about one percent lessdrag than a fuselage 102 having a tail portion 108 with a width thatdecreases at a constant rate or progression but is otherwisesubstantially similar to the example fuselage 102 of FIGS. 1-5.

FIG. 6 illustrates a tail portion 600 of another example fuselage 602disclosed herein. In the illustrated example, the tail portion 600includes a first section 604, a second section 606 and a third section608. In the illustrated example, a tail assembly 610 is disposed on thefirst section 604 and the second section 606. In the illustratedexample, the tail assembly 610 includes a horizontal stabilizer 612 anda vertical stabilizer 614. The example third section 608 is disposed aftof the tail assembly 610. In the illustrated example, the first section604 extends from fore of the vertical stabilizer 614 to a position alonga chord of the horizontal stabilizer 612 (i.e., a position between aleading edge 616 and a trailing edge 618 of the horizontal stabilizer612). In other examples, the first section 604 extends to and from otherpositions along the fuselage 602 (e.g., up to the leading edge 616 ofthe horizontal stabilizer). The example second section 606 of FIG. 6extends from the first section 604 (i.e., from the position along thechord of the horizontal stabilizer 612) to the trailing edge 618 of thehorizontal stabilizer 612. In other examples, the second section 606extends to and from other positions along the fuselage 602. The examplethird section 608 of FIG. 6 extends from the second section 606 (i.e.,from the trailing edge 618 of the horizontal stabilizer 612) to arear-end 620 of the fuselage 602. Thus, in the illustrated example, thethird section 608 is aft of the horizontal stabilizer 612. In otherexamples, the third section 608 extends to and from other positionsalong the fuselage 602.

The example first section 604 has a first shape. In the illustratedexample, a first width of the first section 604 decreases rearwards(i.e., from a front to a rear of the first section 604). Thus, firstlateral surfaces 622 and 624 of the fuselage 602 along the first section604 are converging inboard. In some examples, the first width of thefirst section 604 decreases at a constant rate (i.e., the first lateralsurfaces 622 and 624 of the fuselage 602 along the first section 604 aresubstantially straight). In other examples, the first width decreases atan inconstant or varying rate (i.e., the first lateral surfaces 622 and624 are curved). In the illustrated example, the first lateral surfaces622 and 624 are converging inboard by more than ten degrees relative toa longitudinal axis 625 of the fuselage 602. In other examples, thefirst section 604 is other shapes and, thus, the first lateral surfaces622 and 624 may converge via greater or lesser angles.

In the illustrated example, the second section 606 has a second shape inwhich a second width of the second section 606 is substantially constant(i.e., second lateral surfaces 626 and 628 of the fuselage 602 along theexample second section 606 are oriented within about ten degrees ofbeing parallel to the longitudinal axis 625 of the fuselage 602). In theillustrated example, the second lateral surfaces 626 and 628 areconverging inboard such that the second lateral surfaces 626 and 628 areoriented about five degrees from parallel to the longitudinal axis 625of the fuselage 602. However, the above noted-shape is merely an exampleand, thus, other shapes may be used without departing from the scope ofthis disclosure.

The example third section 608 has a third shape. In the illustratedexample, a third width of the third section 608 decreases rearwards(i.e., from a front to a rear of the third section 608). Thus, thirdlateral surfaces 630 and 632 of the fuselage 602 along the third section608 converge inboard. In some examples, the third width of the thirdsection 608 decreases at a constant rate (e.g., the third lateralsurfaces 630 and 632 of the fuselage 602 along the third section 608 aresubstantially straight). In other examples, the third width decreases atan inconstant or varying rate (e.g., the third lateral surfaces 630 and632 are curved). In the illustrated example, the third lateral surfaces630 and 632 are converging by more than ten degrees relative to thelongitudinal axis 625 of the fuselage 602. In other examples, the thirdsection 608 is other shapes and, thus, the third lateral surfaces 630and 632 may converge via greater or lesser angles. In the illustratedexample, the third section 608 defines the tail-end 620 of the fuselage602.

FIG. 7 illustrates a tail portion 700 of another example fuselage 702disclosed herein. In the illustrated example, the tail portion 700includes a first section 704, a second section 706 and a third section708. In the illustrated example, a tail assembly 710 is disposed on thefirst section 704 and the second section 706. In the illustratedexample, the tail assembly 710 includes a horizontal stabilizer 712 anda vertical stabilizer 714. The example third section 708 is disposed aftof the tail assembly 710. In the illustrated example, the first section704 extends from fore of the vertical stabilizer 714 to a position alonga chord of the horizontal stabilizer 712 (i.e., a position between aleading edge 716 and a trailing edge 718 of the horizontal stabilizer712). In other examples, the first section 704 extends to and from otherpositions along the fuselage 702 (e.g., up to the leading edge 716 ofthe horizontal stabilizer 712). The example second section 706 extendsfrom the first section 704 (i.e., from the position along the chord ofthe horizontal stabilizer 712) to the trailing edge 718 of thehorizontal stabilizer 712. In other examples, the second section 706extends to and from other positions along the fuselage 702. The examplethird section 708 of FIG. 7 extends from the second section 706 (i.e.,from the trailing edge 718 of the horizontal stabilizer 712) to arear-end 720 of the fuselage 702. Thus, in the illustrated example, thethird section 708 is aft of the horizontal stabilizer 712. In otherexamples, the third section 708 extends to and from other positionsalong the fuselage 702.

The example first section 704 has a first shape. In the illustratedexample, a first width of the first section 704 decreases rearwards(i.e., from a front to a rear of the first section 704). Thus, firstlateral surfaces 722 and 724 of the fuselage 702 along the first section704 are converging inboard. In some examples, the first width of thefirst section 704 decreases at a constant rate (i.e., the first lateralsurfaces 722 and 724 of the fuselage 702 along the third section 708 aresubstantially straight). In other examples, the first width decreases atan inconstant or varying rate (i.e., the first lateral surfaces 722 and724 are curved). In the illustrated example, the first lateral surfaces722 and 724 are converging inboard by more than ten degrees relative toa longitudinal axis 725 of the fuselage 702. In other examples, thefirst section 704 is other shapes and, thus, the first lateral surfaces722 and 724 may converge via greater or lesser angles.

In the illustrated example, the second section 706 has a second shape inwhich a second width of the second section 706 is substantially constant(i.e., second lateral surfaces 726 and 728 of the fuselage 702 along theexample second section 706 are oriented within about ten degrees ofbeing parallel to the longitudinal axis 725 of the fuselage 702). In theillustrated example, the second lateral surfaces 726 and 728 arediverging outboard such that the second lateral surfaces 726 and 728 areoriented about five degrees from parallel to the longitudinal axis 725of the fuselage 702. However, the orientation of the second lateralsurfaces 726 and 728 of FIG. 7 is merely an example. Thus, in otherexamples, the second lateral surfaces 726 and 728 have otherorientations.

In the illustrated example, a projection 729 extends from the secondlateral surface 726. In some examples, the projection 729 is coupled tothe second lateral surface 726. In other examples, the projection 729and the second lateral surface 726 are integrally formed. In theillustrated example, the projection 729 curves outward relative to thesecond lateral surface 726. The projection 729 may be a cover or housingsurrounding some or all of one or more components disposed inside thetail portion 700. In some examples, the projection 729 defines an outletsuch as, for example, an exhaust outlet. Further, the above noted-shapesare merely examples and, thus, other shapes may be used withoutdeparting from the scope of this disclosure. In some examples, theprojection 729 is disposed in a different position along the tailportion 700 than illustrated in FIG. 7 (e.g., along the first section704, the third section 708, the other second lateral surface 728, anupsweep, etc.). Although the illustrated example includes the projection729, other examples include other projections and/or no projections. Insome examples, the tail portion 700 includes one or more recesses.

The example third section 708 has a third shape. In the illustratedexample, a third width of the third section 708 decreases rearwards(i.e., from a front to a rear of the third section 708). Thus, thirdlateral surfaces 730 and 732 of the fuselage 702 along the third section708 converge inboard. In some examples, the third width of the thirdsection 708 decreases at a constant rate (e.g., the third lateralsurfaces 730 and 732 of the fuselage 702 along the third section 708 aresubstantially straight). In other examples, the third width decreases atan inconstant or varying rate (e.g., the third lateral surfaces 730 and732 are curved). In the illustrated example, the third lateral surfaces730 and 732 are converging by more than ten degrees relative to thelongitudinal axis 725 of the fuselage 702. In other examples, the thirdsection 708 is other shapes and, thus, the third lateral surfaces 730and 732 may converge via greater or lesser angles. In the illustratedexample, the third section 708 defines the tail-end 720 of the fuselage702.

FIG. 8 illustrates a tail portion 800 of another example fuselage 802disclosed herein. In the illustrated example, the tail portion 800includes a first section 804, a second section 806 and a third section808. In the illustrated example, a tail assembly 810 is disposed on thefirst section 804 and the second section 806. In the illustratedexample, the tail assembly 810 includes a horizontal stabilizer 812 anda vertical stabilizer 814. The example third section 808 is disposed aftof the tail assembly 810.

In the illustrated example, the first section 804 extends from fore ofthe vertical stabilizer 814 to a leading edge 816 of the horizontalstabilizer 812. In other examples, the first section 804 extends to andfrom other positions along the fuselage 802. The example second section806 extends from the first section 804 (i.e., from the leading edge 816of the horizontal stabilizer 812) to a trailing edge 818 of thehorizontal stabilizer 812. Thus, the example second section 804 of FIG.8 extends a distance corresponding to a length of a chord of thehorizontal stabilizer 812. The example third section 808 of FIG. 8extends from the second section 806 (i.e., from the trailing edge 818 ofthe horizontal stabilizer 812) to a rear-end 820 of the fuselage 802.Thus, in the illustrated example, the third section 808 is aft of thehorizontal stabilizer 812.

The example first section 804 has a first shape. In the illustratedexample, a first width of the first section 804 decreases rearwards(i.e., from a front to a rear of the first section 804). Thus, firstlateral surfaces 822 and 824 of the fuselage along the first section 804are converging inboard. In some examples, the first width of the firstsection 804 decreases at a constant rate (i.e., the first lateralsurfaces 822 and 824 of the fuselage along the third section 808 aresubstantially straight). In other examples, the first width decreases atan inconstant or varying rate (i.e., the first lateral surfaces 822 and824 are curved). In the illustrated example, the first lateral surfaces822 and 824 are converging inboard by more than ten degrees relative toa longitudinal axis 825 of the fuselage 802. In other examples, thefirst section 804 is other shapes and, thus, the first lateral surfaces822 and 824 may converge via greater or lesser angles.

In the illustrated example, the second section 806 has a second shape inwhich a second width of the second section 806 is substantially constant(i.e., second lateral surfaces 826 and 828 of the fuselage along theexample second section 806 are oriented within about ten degrees ofbeing parallel to the longitudinal axis 825 of the fuselage 802). In theillustrated example, the second lateral surfaces 826 and 828 areparallel to the longitudinal axis 825 of the fuselage 802. However, theabove noted-shape is merely an example and, thus, other shapes may beused without departing from the scope of this disclosure.

The example third section 808 has a third shape. In the illustratedexample, a third width of the third section 808 decreases rearwards(i.e., from a front to a rear of the third section 808). Thus, thirdlateral surfaces 830 and 832 of the fuselage 802 along the third section808 converges inboard. In some examples, the third width of the thirdsection 808 decreases at a constant rate (e.g., the third lateralsurfaces 830 and 832 of the fuselage 802 along the third section 808 aresubstantially straight). In other examples, the third width decreases atan inconstant or varying rate (e.g., the third lateral surfaces 830 and832 are curved). In the illustrated example, the third lateral surfaces830 and 832 are converging by more than ten degrees relative to thelongitudinal axis 825 of the fuselage 802. In other examples, the thirdsection 808 is other shapes and, thus, the third lateral surfaces 830and 832 may converge via greater or lesser angles. In the illustratedexample, the third section 808 defines the tail-end 820 of the fuselage802.

FIG. 9 depicts an example flow diagram representative of methods orprocesses that may be implemented using, for example, computer readableinstructions. The example process of FIG. 9 may be performed using aprocessor, a controller and/or any other suitable processing device. Forexample, the example process of FIG. 9 may be implemented using codedinstructions (e.g., computer readable instructions) stored on a tangiblecomputer readable medium such as a flash memory, a read-only memory(ROM), and/or a random-access memory (RAM). As used herein, the termtangible computer readable medium is expressly defined to include anytype of computer readable storage and to exclude propagating signals.Additionally or alternatively, the example process of FIG. 9 may beimplemented using coded instructions (e.g., computer readableinstructions) stored on a non-transitory computer readable medium suchas a flash memory, a read-only memory (ROM), a random-access memory(RAM), a cache, or any other storage media in which information isstored for any duration (e.g., for extended time periods, permanently,brief instances, for temporarily buffering, and/or for caching of theinformation). As used herein, the term non-transitory computer readablemedium is expressly defined to include any type of computer readablemedium and to exclude propagating signals.

Alternatively, some or all of the example process of FIG. 9 may beimplemented using any combination(s) of application specific integratedcircuit(s) (ASIC(s)), programmable logic device(s) (PLD(s)), fieldprogrammable logic device(s) (FPLD(s)), discrete logic, hardware,firmware, etc. Also, one or more operations depicted in FIG. 9 may beimplemented manually or as any combination(s) of any of the foregoingtechniques, for example, any combination of firmware, software, discretelogic and/or hardware.

Further, although the example process of FIG. 9 is described withreference to the flow diagram of FIG. 9, other methods of implementingthe process of FIG. 9 may be employed. For example, the order ofexecution of the blocks may be changed, and/or some of the blocksdescribed may be changed, eliminated, sub-divided, or combined.Additionally, one or more of the operations depicted in FIG. 9 may beperformed sequentially and/or in parallel by, for example, separateprocessing threads, processors, devices, discrete logic, circuits, etc.

FIG. 9 is a flowchart representative of an example method 900 that canbe performed to improve aerodynamic performance of an aircraft. Withreference to FIGS. 1-8, the example method 900 of FIG. 9 begins bydirecting the first lateral surfaces 310 and 312 of the first section300 of the fuselage 108 to be converging inboard from a front to a rearof the first section 300 (block 902). In some examples, the firstlateral surfaces 310 and 312 are directed from fore of a first positionalong the fuselage 108 corresponding to a leading edge 202 of thevertical stabilizer 126 to or past a second position along the fuselage108 corresponding to the leading edge 616 of the horizontal stabilizer124.

At block 904, the second lateral surfaces 314 and 316 of the secondsection 302 are directed to be substantially parallel. The secondsection 302 and, thus, the second lateral surfaces 314 and 316 are aftof the first section 300. In some examples, the second lateral surfaces314 and 316 are directed to be substantially parallel such that thesecond lateral surfaces 314 and 316 are oriented ten degrees or lessfrom being parallel to the longitudinal axis 136 of the fuselage 108. Insome examples, the second lateral surfaces 314 and 316 are directed fromthe first section 300 (e.g., from the first lateral surfaces 310 and312, from the second position along the fuselage 108 corresponding tothe leading edge 306 of the horizontal stabilizer 124, from a thirdposition aft of the second position, etc.). At block 906, the secondlateral surfaces 314 and 316 are directed to a fourth positioncorresponding to the trailing edge 308 of the horizontal stabilizer 124.

At block 908, the third lateral surfaces 318 and 320 of the thirdsection 304 of the fuselage 108 are directed to be converging from afront to the rear of the third section 304. The third section 304 is aftof the second section 302. In some examples, the third lateral surfaces318 and 320 are directed from the second section 302 (e.g., from thesecond lateral surfaces 314 and 316, from the fourth position along thefuselage 108 corresponding to the trailing edge 308 of the horizontalstabilizer, etc.) to the tail-end 112 of the aircraft 100. At block 910,the tail assembly 122 is coupled to the first section 300 and the secondsection 302. In some examples, the leading edge 306 of the horizontalstabilizer 124 is extended from the first section 300. In otherexamples, the leading edge 306 of the horizontal stabilizer 124 isextended from the second section 302. The vertical stabilizer 126 may beextended from the first section 300 and/or the second section 302.

Although certain example methods, apparatus and articles of manufacturehave been described herein, the scope of coverage of this disclosure isnot limited thereto. On the contrary, this disclosure covers allmethods, apparatus and articles of manufacture fairly falling within thescope of the claims.

The Abstract at the end of this disclosure is provided to comply with 37C.F.R. §1.72(b) to allow the reader to quickly ascertain the nature ofthe technical disclosure. It is submitted with the understanding that itwill not be used to interpret or limit the scope or meaning of theclaims.

What is claimed is:
 1. An aircraft comprising: a tail portion of afuselage, the tail portion including a first section, a second sectionaft of the first section, and a third section aft of the second section,a first width of the first section decreasing from a front to a rear ofthe first section, a second width of the second section beingsubstantially constant, and a third width of the third sectiondecreasing from a front to a rear of the third section; and a horizontalstabilizer extending from the tail portion such that a trailing edge ofthe horizontal stabilizer extends from the tail portion at or fore anintersection of the second section and the third section and a leadingedge of the horizontal stabilizer extends from the tail portion alongthe first section.
 2. The aircraft of claim 1, further including avertical stabilizer extending from a top surface of the tail portionsuch that a leading edge of the vertical stabilizer extends from thetail portion fore of the horizontal stabilizer.
 3. The aircraft of claim2, wherein the vertical stabilizer extends from the tail portion alongthe first and second sections.
 4. The aircraft of claim 2, whereinsurfaces of the tail portion along the second section are substantiallyparallel to a longitudinal axis of the vertical stabilizer.
 5. Theaircraft of claim 1, wherein an outer surface of the first section isangled more than ten degrees relative to a longitudinal axis of thefuselage.
 6. The aircraft of claim 5, wherein an outer surface of thethird section is angled more than ten degrees relative to thelongitudinal axis of the fuselage.
 7. The aircraft of claim 1, whereinthe second width is substantially constant such that surfaces of thetail portion along the second section are oriented within about tendegrees of parallel to a longitudinal axis of the fuselage.
 8. Anaircraft comprising: a tail portion of a fuselage, the tail portionincluding a first section, a second section aft of the first section,and a third section aft of the second section, the first section havingfirst lateral surfaces converging inboard, the second section havingsecond lateral surfaces that are parallel to each other, and the thirdsection having third lateral surfaces converging inboard; and ahorizontal stabilizer extending from the tail portion such that atrailing edge of the horizontal stabilizer extends from the secondlateral surfaces at or near an intersection of the second section andthe third section.
 9. The aircraft of claim 8, wherein a leading edge ofthe horizontal stabilizer extends from the tail portion along the firstsection.
 10. The aircraft of claim 8, further including a verticalstabilizer extending from a top surface of the tail portion such that aleading edge of the vertical stabilizer extends from the tail portionfore of the horizontal stabilizer.
 11. The aircraft of claim 10, whereinthe vertical stabilizer extends from the tail portion along the firstand second sections.
 12. The apparatus of claim 10, wherein the secondlateral surfaces are substantially parallel to a longitudinal axis ofthe vertical stabilizer.
 13. The apparatus of claim 8, wherein the firstlateral surfaces are angled more than ten degrees relative to alongitudinal axis of the fuselage.
 14. The apparatus of claim 13,wherein the third lateral surfaces are angled by more than ten degreesrelative to the longitudinal axis of the fuselage.
 15. A method ofenhancing aerodynamic performance comprising: directing first lateralsurfaces of a first section of a fuselage of an aircraft to beconverging inboard from a front to a rear of the first section;directing second lateral surfaces of a second section of the fuselage tobe substantially parallel, the second section aft of the first section;directing third lateral surfaces of a third section of the fuselage tobe converging inboard from a front to a rear of the third section, thethird section aft of the second section; and coupling a horizontalstabilizer to the fuselage such that a trailing edge of the horizontalstabilizer extends from the fuselage at or fore an intersection of thesecond section and the third section and a leading edge of thehorizontal stabilizer extends from the fuselage along the first section.16. The method of claim 15, further including coupling a verticalstabilizer to a top surface of the fuselage such that a leading edge ofthe vertical stabilizer extends from the fuselage fore of the horizontalstabilizer.
 17. The method of claim 16, wherein the second lateralsurfaces are substantially parallel to a longitudinal axis of thevertical stabilizer.
 18. The method of claim 15, wherein the firstlateral surfaces are angled more than ten degrees relative to alongitudinal axis of the fuselage.
 19. The method of claim 18, whereinthe third surfaces are angled more than ten degrees relative to thelongitudinal axis of the fuselage.
 20. The method of claim 15, whereinthe second surfaces are angled by ten degrees or less relative to alongitudinal axis of the fuselage.